Device for weaving of fabrics



Feb. 9, 1954 v. SVATY 3,568,560

DEVICE FOR WEAVING OF FABRICS Original Filed April 3, 1950 4Sheets-Sheet l L a Q INVEN VLADIMIR S Y Feb. 9, 1954 v. SVATY 2,668,560

DEVICE FOR WEAVING OF FABRICS Original Filed April 3, 1950 4Sheets-Sheet 2 "IIIIIII/II/IM INVENTOR. Vmwmn? SVATY Feb. 9, 1954V.,SVATY 2,668,560

DEVICE FOR WEAVING OF FABRICS Original Filed April 3, 1950 4Sheets-Sheet 3 "F" A mmw INVENTOR. VLADIMIR SvATY libb Feb. 9, 1954 v,sv 2,668,560

DEVICE FOR WEAVING OF FABRICS I Original Filed April 3, 1950 4Sheets-Sheet 4 ilgf INVENTOR. -AOmng SVATY 'tensioning means.

Patented Feb. 9, 1954 DEVICE FOR WEAVING OF FABRICS Vladimir Svaty,Roztoky, near Jilemnice, Czechoslovakia, assignor of seventy-five percent to Ceskoslovenske Textilni Zavody, narodni podnik, Prague,Czechoslovakia, a company of Czechoslovakia Original application April3, 1950, Serial No.

Divided and this application'January 15, 1952, Serial No. 268,427

Claims priority, application Czechoslovakia April 2, 1949 6 Claims.

The present invention relates to a method and device for weaving offabrics.

This application is a division of my copending application Serial No.153,507, filed April 3, 1950.

The manufacture of fabrics on mechanical weaving looms as hithertocarried out is a rather slow operation, the average speed of whichcannot practically be increased above 190 picks in a minute on fullyautomatic looms. Such looms are highly complex, costly and, as known,too noi y in operation.

The main object of the present invention resides in a substantialacceleration and simplification of the weaving operation. For thispurpose the inserting (picking) of the weft thread into the shed bymeans of an air jet is made use of. The invention aims further to asubstantially simpler and at the same time more efiicient arrangement ofa pneumatic weaving loom,

According to the invention the weaving operation is effected in such away that one or a plurality of weft threads are inserted into aconventional shed of warp threads either from one or from both sides ofthe Warp by means of air jets surrounding and entraining the weft threador threads. The required rotation in the direction of twist of the weftthread is preferably imparted to such jets so as to prevent tearing upthe thread and to smooth the picking motion.

The leading portion of each picked thread is retained at the oppositeside of the warp by a marginal binding for instance by a gauze-likecrossing, i. e. binding of the Weft and warp threads at the margin ofthe fabric, Whereas the rear portion is clamped by tensioning means and,if necessary, additionally secured also by a marginal binding, whereuponby a blow of the reed the weft thread is tensioned under simultaneousbraking of the leading portion by the marginal binding and clamping ofthe rear portion by the The thread is finally out off, the shed changedand the weft thread Woven in. For the purpose of achieving uniform andperfect results as well as economical use of the air the individualbatches of air for each picking motion of the weft thread are adjustedexactly to a quantity which is just sufficient for causing the frontwave of the air jet, by its impact against the free end of the weftthread, to straighten out the thread and impart thereto a suitableacceleration producing a flying movement, whereupon the pressuregradually drops. By this drop of air pressure at the discharge portionof the nozzle there is prevented the imparting of greater ve- ,locitiesto the rear portions of the weft thread,

receiving the picking movement later, eliminating thus the formation ofloops in the weft thread.

According to a further development of the new method the weft thread isfirst unwound from a storage source in the requisite length, subjectedto the entraining influence of a jet produced by a predetermined batchof compressed air, driving the wound-off portion of the thread throughthe shed, the thread retained at the end of the fabric remote from thenozzle and tensioned by a pull acting in a direction opposite to thedirection of the picking movement and after having been woven in it iscut off and its free end retracted towards the nozzle,

A device for carrying out such weaving process corresponds to amechanical loom insofar as there remain the driving means for the warp,whereas the operating means for the weft, including its safety catches(weft stop motion) are replaced by a pneumatic apparatus for insertingthe Weft into the shed, as will be described later. The operation ofsuch a pneumatic loomis noiseless, cheap and very quick. Withapproximately half the input of driving force about double the number.of pickings, or even more may be achieved as compared with hithertoknown looms.

In another embodiment of the device for'carrying out the improved methodthere is arranged in front of the nozzle a pair of cooperatingretracting rollers engaging the thread, said rollers revolving in asense so as to impart movement to the thread opposite to the directionof picking and in one or in both rollers a relieving-recess is provided,said recess being adapted torelease the thread from engagement with theretracting rollers in the moment of operation of the air nozzle.

One or both retracting rollers are preferably yieldingly mounted so asto allow for irregularities in the thickness of the thread.

In the supply of compressed air a throttling valve is provided, and astorage chamber for compressed air interposed between the throttlingvalve and the nozzle, the throttling valve admitting into the chambersuch amount of air only as is required for one picking operation.

Several examples of devices for weaving by the method according to thepresent invention are shown in the accompanying drawings wherem:

Figure 1 is a diagrammatic sectional view of an example of the weftinserting means;

Figure 2 shows a detail of the nozzle;

Figures 3, 4, 5 and 6 show the succession of the individual phases ofoperation in diagrammatic representation;

Figure '7 is a cross-sectional view of a modified nozzle and itssimplified driving-mechanism;

Figure 8 is an elevational view thereof;

Figure 9 illustrates an axial cross-section through one embodiment ofthe device;

Figure 10 is a front view of a 'portionuof the device;

Figure 11 represents on a redueed scalea side view;

Figure 12 illustrates a diagrammatic elevational view of a modifiedembodiment;

Figure 13 illustrates a further modified embodiment;

Figure 14 shows another embodiment 'ofthe winding-off device; and

Figure 15 is a front view ofthe-loomshowing. the overall arrangement ofthe device according;

to the invention.

Referring first to Figures 1 to 6, it may-be seen-- that from a storagebobbin 1 the weft thread 2 is wound off over a small weft brake ,3. Inorder to. .eXactlyadjust the-requisite. length. of the thread awinding-off apparatus is used, ;consistingsin this case of a pair of,pressure rollers 5, 4 ofwhich the lower roller 4 has a rough surface or,isv coveredawithv velvet- Its circumference may correspondapproximately, to the so called reed widt; ofthe fabric, so that onerevolution thereof will supply the requisite length of weft thread. Itmay be driven from a side by means of africtiondisc 6,;mounted'foradjustment .on its shaft 1, driven by the main shaft 8 of the loom. Theupper pressure roller 5 isloaded by a spring 9.

Behind the windingeofiaapparatus the thread passes through suitabletensioning means H], II the upper jaw ID of which is rigidly mountedwhereas the lower jaw. H is biassed against the upper jaw in by a springl2,supported in a rigidly mounted casing 13.. Atwoearm lever M isjournalled at the low free end of. the said jaw H, said lever 14 beingoperated by a cam 'disc E5 on a shaft 16 which is driven from. the mainshaft of the loom, for instance by a chain, or by a. gear transmission.

The weft thread is finally passed through an axial cavity in avalve body11 of. anain nozzle. The nozzle body .I 8 is provided with a mouthpieceis into whose orificea sharp edge of the valve body .i'l projects. Intovthe annular path of air, arranged preferably according to-the principlesof.a.-De Laval nozzle,-there is secured near. the mouthportion astationary blade wheel 23 consisting of-tangentially inclined bladesdeflecting the air, similar to adistributionwheel of a turbine (showndiagrammatically in Fig. 2), by which rotation isimparted to the airjet... Th -.cavity in the nozzle body I8 is in open connection. witha-storage chamberv M for compressed'airconnected over a throttling valve22 with a source of pressure medium; The chamber-2| -may be providedwith adjustable. walls for the adjustment of the volume thereof to aquantity of air which is just required for one picking operation. Thevalve body 5? is mounted for sliding movement in longitudinal directionof the nozzle body I8 and has at its free projecting-end a flange 23engaged by a bell crank lever--24. The latter is journalled at 25 andprovided with a'follower roller 26 at its free end, which rests againstthe circumference of a cam disc 2?, connected with the disc [5 on theshaft 16;

The device described above operates as follows:

The prepared. portion of the weft thread is supplied by the continuouslyoperating winding- 4 oir' mechanism always infront of the clampedtensioning means it, i i. and {the leading portion of the weft thread 2"projects from the orifice of the mouthpiece it of the nozzle 58 afterhaving been cut off from the weft previously inserted, see also Fig. 6.In the first phase of op- V eration, Figure 3, the valve I? of thenozzle 18 is temporarily opened by the influence of the projection 2? onthe cam disc 21 acting on the follower roller is of the lever 24 and theemerging jet of compressed air, accumulated in the chamber 2i tensionsthe weft portion 2, remaining after the weft has been cut off, anddirects it to the shed. In-theimmediately following phase, Figure =4,the projection If! on the cam disc 15 abuts against the free end of thelever M; the clamping action of the lower jaw ll of the tensioning meansis temporarily released setting free the clamped thread 2 in a lengthpreviously wound-off, for flying through the shed under the tensioninginfluence of the air jet.- In the further phase, Figure 5,,the-leadingportiomofthe picked threadis retainedatithe opposite. side of the warpby a marginal binding of sthexweft threads by e. g. 3 warp threads, theweft :thread is 'tensionedby a blow of the reed and inthe last phasewoven inby the change of the shed, cut offby a cutting edge 23, Fig.5,whereupon the whole, process is repeated.

A modified embodiment of the device isshown in Figures '7 and 8.

The nozzle 3i showninFigure 7 comprises an air passage 32 and.-a.,central passage 33 .for .-the thread 34. Mounted for slidingmovement in a bore 35 is a valve piston 35 adapted toclose the conduit3'! for the supply ofcompressed'airinto the nozzle. The valvetfiisbiassed by-a spring 38 into closed position. Atthe outer end of thevalve stem a collar. 39 is rigidlysecureoh said collar beingengaged by alever to. journalled on a pivot 4| in the casting 42 of the .nozzle. Thelever- 40-carries a follower 43 arranged-forecoperation with a cam M.journalled on a pivot-45. The cam is'provided with a projection 46.

Mounted for rotation on top of the casing are two retracting rollers 41and'48 driven in synchronism with the .drive of the .cam' M by anysuitable means, not shown, for instance by-bevel gearing, inthedirection of arrows M. Arelieving recess l9v is provided in one or inboth, of the, rollers, in the example shown in the roller 41andpreferably at least one of the retracting rollers .is yieldinglymounted.

As shown in Fig. 7 the arrangement issuch that the thread 34 passes in astraight line from the supplying device (winding-off apparatus)throughthe rollers 41, 48 into the passage-33 of the nozzle 3i.

The device described above operates-as follows:

Shortly before the beginning of the'picking operation the relievingrecess 4% in-the-rollerfl assumes approximately .the position showninFig. 8 in which. it relieves the thread 34 from thread is seeuredby agauze-like,- crossingimthe marginal portion of the fabric, for instancein the width of 3 or more warp threads at the end which is remote fromthe nozzle. At this time the rollers 41 and 48 have already rotated tosuch an extent from the position shown in Figure 8 that the fullcircumferential portion of the roller 41 engages the thread 34 andexerts now a pulling action thereon in the direction of the arrow P inFigure 8, tensioning thus the thread. Hereupon the reed imparts a blowto the weft thread, the shed is changed and the weft thread woven in. Acutting edge or a shearing mechanism arranged near the margin of thefabric cuts off the thread, which is now retracted backwards in thedirection of the arrow P by rollers 41, 48 so that the free end of thethread, hanging down from the discharge orifice of the nozzle 3| isretracted back into the nozzle.

The winding-off apparatus for preparing the weft thread may also bmodified and examples of such modified arrangements will now bedescribed.

Figures 9 to 11 show one such modification.

The device comprises a winding-off drum which is preferably slightlyconical, as illustrated in the drawing. The drum 5| is rigidly securedto a shaft 52 which receives movement from any desired drivingmechanism, not illustrated, for instance through a gearing from the mainshaft of the machine. The shaft 52 is supported in bearings 53, 54,mounted in a rigid sleeve 55 in the frame of the machine. On the sleeve55 in the interior of the drum 5| a gear 58 is rigidly keyed on, saidgear being a so-called sun-gear of a planet differential gearing whichwill be described later. A carrier 59 is secured to the bottom of thedrum 5|, said carrier mounting for instance on a pivot 66 a planet gear6| meshing with the sun-gear 58. The gear 6| is in engagement with adriven gear 62 which is rigidly secured to a disc 63 which in thefollowing description will be called casting-off disc. From theembodiment as illustrated it is apparent that upon rotation of the shaft52 through one revolution, the drum 5|, which is rigidly secured to thisshaft will carry out also one revolution, whereas the casting-off disc63 will at the same time carry out two revolutions in the same directionof rotation by the intermediary of the planet gearing.

The circumference of the drum 5| is provided with a shallow groove 64which serves for mounting a guide 51 for the thread and further thereare two thread entraining dogs having the form of projections 65 (seealso Figure which are positioned diametrically opposite each other. Thdisc 63 is provided with one extension 66 which in the followingdescription will be called casting off member. This extension 66 isslightly higher than the projection 65 on the drum 5!.

On the carrier 61, which is mounted for rocking movement around the axiof the shaft 52 and is adjustable in any desired position for instanceby a screw 56 on the sleeve 55, a braking wheel 69 is mounted for freerotation on a pivot 68. In the embodiment shown the wheel 69 is providedwith a ring gear 10 engaging a ring gear 7| the ratio of diameters ofthe rings being such that upon one revolution of the drum 5| the brakingwheel will carry out two revolutions. The braking wheel has a flange 12of such a formation that between the wheel 69 and the surface of th drum5| a gap 13 is left for the receiving of the thread 14 supplied from anysuitable storage source for, instance from a bobbin or the like.

On one point of its circumference the braking wheel is provided with abraking member for instance in the shape of a projection 15 (see Fig.10). This projection is arranged in such a way that when it is oppositethe surface of the drum 5| it presses the thread 14 against thecircumference thereof firmly clamping or braking the thread.

From the foregoing it is obvious that the braking wheel 69 revolves withthe same velocity as the disc 63, i. e. twice as fast as the drum 5|.

The device operates as follows:

The thread supplied from the bobbin passes through the gap I3 along thecircumference of the drum 5|, to point 16 (see Figure 11) where it isintroduced into a taking-off mechanism, for instance a feeding device ofa mehanical or pneumatic loom or the like. This position A of the threadis shown in Figure 11 with a broken line. Upon rotation of the drum 5|the dog 65 engages the thread 14 and carries it along. A loop is thusformed on the thread, marked with B in Figure 11. In the meantime,however, the casting oif extension 66 on the disc 63 catches up with theprojection 65, since it travels with double its velocity, until finallyin the required moment it overtakes the projection 65 and in consequenceof its greater height, or possibly of its suitably shaped ramp, it castsoff the thread 14 from the projection 65 i. e. disengages the threadfrom the projection. At the same time, however, the braking projection15 on the braking wheel 59 has been positioned against the drum 5| andhas clamped the thread, so that the feeding mechanism 16 can now feedsuch a length of thread only as has been pulled in this way into theloop B. The thread in the moment of feeding is shown in Figure 11 by achain line C.

The device measures in this way a predetermined length of thread with ahigh degree of accuracy since the moment of casting oil the thread fromthe projection 65 may be exactly controlled.

In the example as described and illustrated the drum is provided withtwo projections 65 and the disc 63 with a single extension 66. It isevident, of course, that any other number of such projections may bearranged, for instance three or four projections 65 on the drum and oneorv two extensions 66 on the disc 63. In this case the ratio or rotationof the casting-off disc to the velocity of the winding-off drum has tobe selected in accordance with the proportion of the number of dogs 65on the winding-off drum to the number of casting-off members 66 on thedisc.

The same applies to the braking wheel 69 which may be provided also withthe plurality of braking extensions 15; in such a case the velocity ofthe braking wheel has to be suitably adjusted.

Figures 12 and 13 illustrate other modified embodiments of thewinding-off mechanism.

According to Figure 12 the winding-oil drum 5| and the braking wheel 69are arranged in a similar way as in the embodiment according to Figures9 to 11. The casting-off member, however, consists in this case of astationary ramp 18 which in the illustrated example is rigidly secured,for instance to a sleeve 79 on which it may be adjusted in anyconventional manner, for instance by a screw 66. The operation of thisembodiment will be apparent from the preceding explanation. Theprojection 65, entraining the thread 14 carries the thread to the ramp18, along which the thread is shifted radially in the direcaoespoo tion:from. the axis of :rotation: .of :the drum 5! until it-is castofifromengagement withE-the projection 65.

Because the stationary ramp maybe objectionable for certain kindsofthreads the device-may bearranged'ina way shown in Figure 13:.

Alsoin. this case the drum 5i andsthe bra-king wheel 69 are arrangedsimilar as in the example according to Figure -9, but .the.lcastingeoftimember consists of a-:1ever -86; journalled 'ion astationartyraxis 8|; The lever .isbiassed by .aspring 82 incounter-clockwise .direction.into inoperative positioniand is providedwith-a rampBS cooperating with'projectionsfi l. on the drum-"5L1 :Uponmovement of the drum 5! the thread. l4

--is' entrained. by :the projection and as soon 'as itereachesma.positionaoppositethe end. surface of. the. lever- 86,-". the.projection .84 cabuts. against the ramp'l83 .rockingthe lever 861 inclockwise direction; the thread is :thus, lifted-abovepthe.projectionyBS; andsoreleased; In. consequence of the ratio:ofz:distancesfromwthe axis of rotation 1.8I tolithe extension .84.andzfrom the =.axis of rotation .81 to :the endasurfaceof the-lever '88the said end surface ofgthe-.lev.er;moyes. with-a: "higher velocitythan; the =.circ,umfer,ence .of. the

dhu'mfii, so thatialso in thiscasean overtaking movement. iae.,a.smooth-diseng gement of, the

thread: from. the projection: 55 takes. place.-

,A further modificationzis shown, in .;Fi ure 1.4.-

lnqthisleasea pairof grooved discs-N182 ,are mounted at a-suitabledistance. and provided'by a requisite numberef. ropes R preferably ofround cross-section of any desired ma r als ne. :dis

9.1 of. thi :pair. 11S; driven. .at a requisite. veloc ty fr m a ydesired. dr.irving mechanism or receiv drivelrrompa pu11ey'93from-.a-ny-shaft ofi he main machine. The driven-disc 9 I- is provided:with a conical ext ion 94 al n the cir umference of which the e r lls apre sure z'winding '3 01 e the position of the. l t r can be a justed toan desired radius of V the con ica-l extension -94 for the purpose ofadjusting the winding-oijfiyelocity and in this-waythe length of thesupplied piece of thread The device operates as follows:

The threadefrom .the storage bobbin 90 is inserted underneath thepressure winding oller .95 on the conical extension and is thenalternately interlaced between the ropes-.Rdhy'whiGh the pair ofgrooveddiscs. 9t, 92 ,is surrounded, whereupon. in the places? it is introducedinto .asmachine, not shown, to which it. supplies pieces of .threads.The device-is :thus preparedior operation. Afterthe machine together-with. the

feeder has been set in operation the threadds wound-on by the roller 95,entrained between-the ropes and forms ,a loose loop ,-for .such a length-.of time until its end which is gripped by any desired feedingmechanism oithe proper machine, ,such as by the pickingelement ofameehanical loom .or by a nozzle-of a pneumatic loom, is, together withthe wound off loopof anadjusted length, pulled for instance into'theshed on the said loom-under simultaneous braking. and cutting-offoperation, whereupon ;-the procedure is repeated.

ure 15. shows'the overall arrangement of the loom provided with adeviceaccording to the invention. The loom marked ;with .th e generalreference-numeral may comprise the usual warp operatingmechanisms whichare. well known and :need ot-be. described in detail-1;. At one, or .at,both sides of the loom the-nozzle mechanism marked nerally I 26 is,moiinted. In front of the nozzle the winding-off apparatus -l 21- isarranged, preparing the predetermined length of the thread, markedhereI28; supplied by a bobbin I29 for. picking .by-the nozzle. Compressedair is supplied by a conduit I36 .over a throttling valve 53! into astorage chamber 132 and. from here through a tube! 33 into the nozzle.

It is an important feature of the invention to provide the storagechamber 132 ior compressed air, as in this way exactly measuredbatchesof air. can besupplied to the nozzle; only in this way uniformresults -may be obtained; For this reason it is also important ,to beable to changethe volume of this storage chamber. To this end it. ispossible to use either rseveral :interchangeable chambers of differentvolumenorzto'arrange a substantially cylindrical. storage. chambers:provided with an adjustable piston 1.34.. "By changing pfrthe position,of -thi;s:.;piston :the wollime of the s or e chamhercan beareadily"changed-in theze rre pondence .ewiththe prevailing .conditions.Furthermore, in consequence of .thisbanrangement the entraihihg efiect;of, thesairxjet is maximum: a t be nning of r the. blowing op t on;whereu en'i gradually sinks eupon the drop of. pre ure in the .ehamber Ili Theysfullpressureiinpact of the compressedair is';-impar.ted-;to theleadin -port on orthethread :onhr, whereas the subsequent portions of:the thread raressuh- ,rieetedito afar smallerinfluence ofthe an get. In

this way a correct picking-operation is-assured. 1-1 pm the {other hand.the vair pressurewould :remain constant or substantially -eonsta;ntthroughout. the -full "period of picking operation: the thread would.beliableto b come entan led a the, rear portions thereoi,: which wouldbehemojectedzto the ,dIiV IIgyfOII ofrthezair 31613; f, :a onger -,t meW0 1dbe c 1 rated-m re han :the leadin p tion and-mig t asi y overtakete'latter during their flight. tllire l -kl. the :Shed; this Wou1d,,ru1.t inthe weft thre :be emins entangled:

It of. cour pos ible. instead ofas-ins nozzl to ..arrange whole system:of' nozzles. exit t .e ehother. or inacommon body -by whioh diffierent;o ..diii r nt v o ure weft thr adam v picked..- Accordingtoqrequirements. a substitutionlor. change .ofzawei t thread byanotherthread maybe cfiected inany momentby amere shifting of the commonbody.

In, addition ,.to..the abovernentioned ibafc tadvanta esthe invention is,iurther dvant geous inter alia .by. the, factthtitit makes possible thw av n -inst. even very "thin.v Wefts and als of wefts .of any desiredthickness and on little strength ,as. well as. wefts of .,a slighttwister-even withoutthe Sam becauselthere are.-r1ev such i orourequirements placedon. he 1 quality Q th W -asinweavingpn-a u 1el0 m-While I have disclosed. the principles -of' my invention. in ,connection.- with several, embodi- ,rnents .it willqbe understood. .thatthese embodiments. re givenby way. -0f.. x mp1e..0n1v and-notas,1imiting.the,scope of the inv.ention,as.se t.;orth in the appendedclaims...

Inlaim:

1. A ,devicejor .weavingiof fabrics-comprising in combination means, foroperating 1 the .tweft threads, a. .nozzle forlthe. production .of. an.7 .air jet; p ed .to entrainthe .Weft threadinto the shed o p th ads, awind n -off. drumfor the weftthread, at least-one thread-pntrainingdogon--the winding-off drum, acastin off member adapted-to release thethread from,.engagement with? .the said dog, a braking -member adapted.to-cooperate iwith the winding-01f drum and with the weft threadpassing between the said braking member and the winding-01f drum andadapted to brake the thread in the moment of its release from engagementwith the dog.

2. A device for weaving of fabrics comprising in combination means foroperating the weft threads, a nozzle for the production of an air jet,adapted to entrain the weft thread into the shed of warp threads, 2.winding-oil drum for the weft thread, at least one thread-entraining dogon the winding-E drum, a casting off member, adapted to release thethread from engagement with th said dog, a braking wheel cooperatingwith the winding-off drum, a gap between the circumference of thebraking wheel and the winding-off drum for free passage of the thread, abraking extension on at least one point of the circumference of thebraking wheel, said braking extension being adapted to close the gap andclamp the thread.

3. A device for weaving of fabrics comprising in combination means foroperating the weft, a nozzle for the production of an air jet adapted toentrain the weft thread into the shed, a rotatable winding-off drum forthe weft thread, at least one thread-entraining dog on the windingofidrum, a casting off disc mounted for rotation in close proximity of thewinding-off drum, a casting off member provided on the casting off disc,means for rotating the casting off disc at a higher velocity than thewinding-off drum, the ratio of velocity of the casting-off disc to thevelocity of the winding-01f drum being equal to the proportion of thenumber of dogs on the winding-ofl drum to the number of casting-offmembers on the disc.

4. A device as claimed in claim 1 wherein the winding-off drum isprovided with a groove for the thread.

5. A device as claimed in claim 1 wherein the winding-on drum isprovided with a groove for the thread and with a guide mounted in thesaid groove.

6. A device for weaving of fabrics comprising in combination means foroperating the weft, a nozzle for the production of an air jet adapted toentrain the weft thread into the shed, a rotatable winding-off drum forthe weft thread. at least one thread-entraining do on the winding-ofidrum, a casting-off disc, mounted for rotation in close proximity of thewinding-01f drum, a casting 011 member provided on the casting off disc,a planet gearing adapted to impart rotation to the winding-01f drum androtation at higher velocity to the casting-off disc, a braking wheelmounted for cooperation with the winding-off drum, a gearing on thecircumference of the winding-off drum, a gearin on the braking wheelmeshing with the said gearing on the windingoif drum.

VLADIMJ IR SVATY.

References Cited in the file of this patent UNITED STATES PATENTS NumberName Date 1,368,691 Brooks Feb. 15, 1921 2,005,391 Pool June 18, 19352,501,982 Zerbee Mar. 28, 1950 2,519,786 Paabo Aug. 22,

